21=2(x+4)

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Solution for 21=2(x+4) equation:


Simplifying
21 = 2(x + 4)

Reorder the terms:
21 = 2(4 + x)
21 = (4 * 2 + x * 2)
21 = (8 + 2x)

Solving
21 = 8 + 2x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2x' to each side of the equation.
21 + -2x = 8 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + -2x = 8 + 0
21 + -2x = 8

Add '-21' to each side of the equation.
21 + -21 + -2x = 8 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 8 + -21
-2x = 8 + -21

Combine like terms: 8 + -21 = -13
-2x = -13

Divide each side by '-2'.
x = 6.5

Simplifying
x = 6.5

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